How can I remove the e-mail verification on register?
Are you talking about the e-mail, that contains the verification link for the new registered user?
If users are able to register themself, you cannot disable this verification because of security reasons. You as the forum operator can only abstain from the verification in case of the registration of a new user, performed by you as the forum administrator inside the admin panel.
Trenne niemals Müll, denn er hat nur eine Silbe!